The concimiento that the two stellar populations have different age is very important when we consider the origin of galaxiasy its evolution. Which existed first, the spiral or elliptical? Until the discovery of populations I and II of Baade, most astrophysicists have believed that elliptical galaxies formula began to be globular (Eo) and that later evolved from Er to E7, as they aged, becoming then spirals S or SB. Following the discovery of Baade know that only spiral galaxies with gas and dust present in her arms young stars of types A and B. From this it follows that only the galaxies that contain young stars are recent turn.
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